drivers/gpu/drm/etnaviv/etnaviv_gem.c

   1 /*
   2  * Copyright (C) 2015 Etnaviv Project
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 as published by
   6  * the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include <linux/spinlock.h>
  18 #include <linux/shmem_fs.h>
  19
  20 #include "etnaviv_drv.h"
  21 #include "etnaviv_gem.h"
  22 #include "etnaviv_gpu.h"
  23 #include "etnaviv_mmu.h"
  24
  25 static void etnaviv_gem_scatter_map(struct etnaviv_gem_object *etnaviv_obj)
  26 {
  27         struct drm_device *dev = etnaviv_obj->base.dev;
  28         struct sg_table *sgt = etnaviv_obj->sgt;
  29
  30         /*
  31          * For non-cached buffers, ensure the new pages are clean
  32          * because display controller, GPU, etc. are not coherent.
  33          */
  34         if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK)
  35                 dma_map_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL);
  36 }
  37
  38 static void etnaviv_gem_scatterlist_unmap(struct etnaviv_gem_object *etnaviv_obj)
  39 {
  40         struct drm_device *dev = etnaviv_obj->base.dev;
  41         struct sg_table *sgt = etnaviv_obj->sgt;
  42
  43         /*
  44          * For non-cached buffers, ensure the new pages are clean
  45          * because display controller, GPU, etc. are not coherent:
  46          *
  47          * WARNING: The DMA API does not support concurrent CPU
  48          * and device access to the memory area.  With BIDIRECTIONAL,
  49          * we will clean the cache lines which overlap the region,
  50          * and invalidate all cache lines (partially) contained in
  51          * the region.
  52          *
  53          * If you have dirty data in the overlapping cache lines,
  54          * that will corrupt the GPU-written data.  If you have
  55          * written into the remainder of the region, this can
  56          * discard those writes.
  57          */
  58         if (etnaviv_obj->flags & ETNA_BO_CACHE_MASK)
  59                 dma_unmap_sg(dev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL);
  60 }
  61
  62 /* called with etnaviv_obj->lock held */
  63 static int etnaviv_gem_shmem_get_pages(struct etnaviv_gem_object *etnaviv_obj)
  64 {
  65         struct drm_device *dev = etnaviv_obj->base.dev;
  66         struct page **p = drm_gem_get_pages(&etnaviv_obj->base);
  67
  68         if (IS_ERR(p)) {
  69                 dev_err(dev->dev, "could not get pages: %ld\n", PTR_ERR(p));
  70                 return PTR_ERR(p);
  71         }
  72
  73         etnaviv_obj->pages = p;
  74
  75         return 0;
  76 }
  77
  78 static void put_pages(struct etnaviv_gem_object *etnaviv_obj)
  79 {
  80         if (etnaviv_obj->sgt) {
  81                 etnaviv_gem_scatterlist_unmap(etnaviv_obj);
  82                 sg_free_table(etnaviv_obj->sgt);
  83                 kfree(etnaviv_obj->sgt);
  84                 etnaviv_obj->sgt = NULL;
  85         }
  86         if (etnaviv_obj->pages) {
  87                 drm_gem_put_pages(&etnaviv_obj->base, etnaviv_obj->pages,
  88                                   true, false);
  89
  90                 etnaviv_obj->pages = NULL;
  91         }
  92 }
  93
  94 struct page **etnaviv_gem_get_pages(struct etnaviv_gem_object *etnaviv_obj)
  95 {
  96         int ret;
  97
  98         lockdep_assert_held(&etnaviv_obj->lock);
  99
 100         if (!etnaviv_obj->pages) {
 101                 ret = etnaviv_obj->ops->get_pages(etnaviv_obj);
 102                 if (ret < 0)
 103                         return ERR_PTR(ret);
 104         }
 105
 106         if (!etnaviv_obj->sgt) {
 107                 struct drm_device *dev = etnaviv_obj->base.dev;
 108                 int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 109                 struct sg_table *sgt;
 110
 111                 sgt = drm_prime_pages_to_sg(etnaviv_obj->pages, npages);
 112                 if (IS_ERR(sgt)) {
 113                         dev_err(dev->dev, "failed to allocate sgt: %ld\n",
 114                                 PTR_ERR(sgt));
 115                         return ERR_CAST(sgt);
 116                 }
 117
 118                 etnaviv_obj->sgt = sgt;
 119
 120                 etnaviv_gem_scatter_map(etnaviv_obj);
 121         }
 122
 123         return etnaviv_obj->pages;
 124 }
 125
 126 void etnaviv_gem_put_pages(struct etnaviv_gem_object *etnaviv_obj)
 127 {
 128         lockdep_assert_held(&etnaviv_obj->lock);
 129         /* when we start tracking the pin count, then do something here */
 130 }
 131
 132 static int etnaviv_gem_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
 133                 struct vm_area_struct *vma)
 134 {
 135         pgprot_t vm_page_prot;
 136
 137         vma->vm_flags &= ~VM_PFNMAP;
 138         vma->vm_flags |= VM_MIXEDMAP;
 139
 140         vm_page_prot = vm_get_page_prot(vma->vm_flags);
 141
 142         if (etnaviv_obj->flags & ETNA_BO_WC) {
 143                 vma->vm_page_prot = pgprot_writecombine(vm_page_prot);
 144         } else if (etnaviv_obj->flags & ETNA_BO_UNCACHED) {
 145                 vma->vm_page_prot = pgprot_noncached(vm_page_prot);
 146         } else {
 147                 /*
 148                  * Shunt off cached objs to shmem file so they have their own
 149                  * address_space (so unmap_mapping_range does what we want,
 150                  * in particular in the case of mmap'd dmabufs)
 151                  */
 152                 fput(vma->vm_file);
 153                 get_file(etnaviv_obj->base.filp);
 154                 vma->vm_pgoff = 0;
 155                 vma->vm_file  = etnaviv_obj->base.filp;
 156
 157                 vma->vm_page_prot = vm_page_prot;
 158         }
 159
 160         return 0;
 161 }
 162
 163 int etnaviv_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 164 {
 165         struct etnaviv_gem_object *obj;
 166         int ret;
 167
 168         ret = drm_gem_mmap(filp, vma);
 169         if (ret) {
 170                 DBG("mmap failed: %d", ret);
 171                 return ret;
 172         }
 173
 174         obj = to_etnaviv_bo(vma->vm_private_data);
 175         return obj->ops->mmap(obj, vma);
 176 }
 177
 178 int etnaviv_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 179 {
 180         struct drm_gem_object *obj = vma->vm_private_data;
 181         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 182         struct page **pages, *page;
 183         pgoff_t pgoff;
 184         int ret;
 185
 186         /*
 187          * Make sure we don't parallel update on a fault, nor move or remove
 188          * something from beneath our feet.  Note that vm_insert_page() is
 189          * specifically coded to take care of this, so we don't have to.
 190          */
 191         ret = mutex_lock_interruptible(&etnaviv_obj->lock);
 192         if (ret)
 193                 goto out;
 194
 195         /* make sure we have pages attached now */
 196         pages = etnaviv_gem_get_pages(etnaviv_obj);
 197         mutex_unlock(&etnaviv_obj->lock);
 198
 199         if (IS_ERR(pages)) {
 200                 ret = PTR_ERR(pages);
 201                 goto out;
 202         }
 203
 204         /* We don't use vmf->pgoff since that has the fake offset: */
 205         pgoff = ((unsigned long)vmf->virtual_address -
 206                         vma->vm_start) >> PAGE_SHIFT;
 207
 208         page = pages[pgoff];
 209
 210         VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address,
 211              page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT);
 212
 213         ret = vm_insert_page(vma, (unsigned long)vmf->virtual_address, page);
 214
 215 out:
 216         switch (ret) {
 217         case -EAGAIN:
 218         case 0:
 219         case -ERESTARTSYS:
 220         case -EINTR:
 221         case -EBUSY:
 222                 /*
 223                  * EBUSY is ok: this just means that another thread
 224                  * already did the job.
 225                  */
 226                 return VM_FAULT_NOPAGE;
 227         case -ENOMEM:
 228                 return VM_FAULT_OOM;
 229         default:
 230                 return VM_FAULT_SIGBUS;
 231         }
 232 }
 233
 234 int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset)
 235 {
 236         int ret;
 237
 238         /* Make it mmapable */
 239         ret = drm_gem_create_mmap_offset(obj);
 240         if (ret)
 241                 dev_err(obj->dev->dev, "could not allocate mmap offset\n");
 242         else
 243                 *offset = drm_vma_node_offset_addr(&obj->vma_node);
 244
 245         return ret;
 246 }
 247
 248 static struct etnaviv_vram_mapping *
 249 etnaviv_gem_get_vram_mapping(struct etnaviv_gem_object *obj,
 250                              struct etnaviv_iommu *mmu)
 251 {
 252         struct etnaviv_vram_mapping *mapping;
 253
 254         list_for_each_entry(mapping, &obj->vram_list, obj_node) {
 255                 if (mapping->mmu == mmu)
 256                         return mapping;
 257         }
 258
 259         return NULL;
 260 }
 261
 262 void etnaviv_gem_mapping_reference(struct etnaviv_vram_mapping *mapping)
 263 {
 264         struct etnaviv_gem_object *etnaviv_obj = mapping->object;
 265
 266         drm_gem_object_reference(&etnaviv_obj->base);
 267
 268         mutex_lock(&etnaviv_obj->lock);
 269         WARN_ON(mapping->use == 0);
 270         mapping->use += 1;
 271         mutex_unlock(&etnaviv_obj->lock);
 272 }
 273
 274 void etnaviv_gem_mapping_unreference(struct etnaviv_vram_mapping *mapping)
 275 {
 276         struct etnaviv_gem_object *etnaviv_obj = mapping->object;
 277
 278         mutex_lock(&etnaviv_obj->lock);
 279         WARN_ON(mapping->use == 0);
 280         mapping->use -= 1;
 281         mutex_unlock(&etnaviv_obj->lock);
 282
 283         drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
 284 }
 285
 286 struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
 287         struct drm_gem_object *obj, struct etnaviv_gpu *gpu)
 288 {
 289         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 290         struct etnaviv_vram_mapping *mapping;
 291         struct page **pages;
 292         int ret = 0;
 293
 294         mutex_lock(&etnaviv_obj->lock);
 295         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, gpu->mmu);
 296         if (mapping) {
 297                 /*
 298                  * Holding the object lock prevents the use count changing
 299                  * beneath us.  If the use count is zero, the MMU might be
 300                  * reaping this object, so take the lock and re-check that
 301                  * the MMU owns this mapping to close this race.
 302                  */
 303                 if (mapping->use == 0) {
 304                         mutex_lock(&gpu->mmu->lock);
 305                         if (mapping->mmu == gpu->mmu)
 306                                 mapping->use += 1;
 307                         else
 308                                 mapping = NULL;
 309                         mutex_unlock(&gpu->mmu->lock);
 310                         if (mapping)
 311                                 goto out;
 312                 } else {
 313                         mapping->use += 1;
 314                         goto out;
 315                 }
 316         }
 317
 318         pages = etnaviv_gem_get_pages(etnaviv_obj);
 319         if (IS_ERR(pages)) {
 320                 ret = PTR_ERR(pages);
 321                 goto out;
 322         }
 323
 324         /*
 325          * See if we have a reaped vram mapping we can re-use before
 326          * allocating a fresh mapping.
 327          */
 328         mapping = etnaviv_gem_get_vram_mapping(etnaviv_obj, NULL);
 329         if (!mapping) {
 330                 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
 331                 if (!mapping) {
 332                         ret = -ENOMEM;
 333                         goto out;
 334                 }
 335
 336                 INIT_LIST_HEAD(&mapping->scan_node);
 337                 mapping->object = etnaviv_obj;
 338         } else {
 339                 list_del(&mapping->obj_node);
 340         }
 341
 342         mapping->mmu = gpu->mmu;
 343         mapping->use = 1;
 344
 345         ret = etnaviv_iommu_map_gem(gpu->mmu, etnaviv_obj, gpu->memory_base,
 346                                     mapping);
 347         if (ret < 0)
 348                 kfree(mapping);
 349         else
 350                 list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
 351
 352 out:
 353         mutex_unlock(&etnaviv_obj->lock);
 354
 355         if (ret)
 356                 return ERR_PTR(ret);
 357
 358         /* Take a reference on the object */
 359         drm_gem_object_reference(obj);
 360         return mapping;
 361 }
 362
 363 void *etnaviv_gem_vmap(struct drm_gem_object *obj)
 364 {
 365         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 366
 367         if (etnaviv_obj->vaddr)
 368                 return etnaviv_obj->vaddr;
 369
 370         mutex_lock(&etnaviv_obj->lock);
 371         /*
 372          * Need to check again, as we might have raced with another thread
 373          * while waiting for the mutex.
 374          */
 375         if (!etnaviv_obj->vaddr)
 376                 etnaviv_obj->vaddr = etnaviv_obj->ops->vmap(etnaviv_obj);
 377         mutex_unlock(&etnaviv_obj->lock);
 378
 379         return etnaviv_obj->vaddr;
 380 }
 381
 382 static void *etnaviv_gem_vmap_impl(struct etnaviv_gem_object *obj)
 383 {
 384         struct page **pages;
 385
 386         lockdep_assert_held(&obj->lock);
 387
 388         pages = etnaviv_gem_get_pages(obj);
 389         if (IS_ERR(pages))
 390                 return NULL;
 391
 392         return vmap(pages, obj->base.size >> PAGE_SHIFT,
 393                         VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 394 }
 395
 396 static inline enum dma_data_direction etnaviv_op_to_dma_dir(u32 op)
 397 {
 398         if (op & ETNA_PREP_READ)
 399                 return DMA_FROM_DEVICE;
 400         else if (op & ETNA_PREP_WRITE)
 401                 return DMA_TO_DEVICE;
 402         else
 403                 return DMA_BIDIRECTIONAL;
 404 }
 405
 406 int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
 407                 struct timespec *timeout)
 408 {
 409         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 410         struct drm_device *dev = obj->dev;
 411         bool write = !!(op & ETNA_PREP_WRITE);
 412         int ret;
 413
 414         if (op & ETNA_PREP_NOSYNC) {
 415                 if (!reservation_object_test_signaled_rcu(etnaviv_obj->resv,
 416                                                           write))
 417                         return -EBUSY;
 418         } else {
 419                 unsigned long remain = etnaviv_timeout_to_jiffies(timeout);
 420
 421                 ret = reservation_object_wait_timeout_rcu(etnaviv_obj->resv,
 422                                                           write, true, remain);
 423                 if (ret <= 0)
 424                         return ret == 0 ? -ETIMEDOUT : ret;
 425         }
 426
 427         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 428                 if (!etnaviv_obj->sgt) {
 429                         void *ret;
 430
 431                         mutex_lock(&etnaviv_obj->lock);
 432                         ret = etnaviv_gem_get_pages(etnaviv_obj);
 433                         mutex_unlock(&etnaviv_obj->lock);
 434                         if (IS_ERR(ret))
 435                                 return PTR_ERR(ret);
 436                 }
 437
 438                 dma_sync_sg_for_cpu(dev->dev, etnaviv_obj->sgt->sgl,
 439                                     etnaviv_obj->sgt->nents,
 440                                     etnaviv_op_to_dma_dir(op));
 441                 etnaviv_obj->last_cpu_prep_op = op;
 442         }
 443
 444         return 0;
 445 }
 446
 447 int etnaviv_gem_cpu_fini(struct drm_gem_object *obj)
 448 {
 449         struct drm_device *dev = obj->dev;
 450         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 451
 452         if (etnaviv_obj->flags & ETNA_BO_CACHED) {
 453                 /* fini without a prep is almost certainly a userspace error */
 454                 WARN_ON(etnaviv_obj->last_cpu_prep_op == 0);
 455                 dma_sync_sg_for_device(dev->dev, etnaviv_obj->sgt->sgl,
 456                         etnaviv_obj->sgt->nents,
 457                         etnaviv_op_to_dma_dir(etnaviv_obj->last_cpu_prep_op));
 458                 etnaviv_obj->last_cpu_prep_op = 0;
 459         }
 460
 461         return 0;
 462 }
 463
 464 int etnaviv_gem_wait_bo(struct etnaviv_gpu *gpu, struct drm_gem_object *obj,
 465         struct timespec *timeout)
 466 {
 467         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 468
 469         return etnaviv_gpu_wait_obj_inactive(gpu, etnaviv_obj, timeout);
 470 }
 471
 472 #ifdef CONFIG_DEBUG_FS
 473 static void etnaviv_gem_describe_fence(struct fence *fence,
 474         const char *type, struct seq_file *m)
 475 {
 476         if (!test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->flags))
 477                 seq_printf(m, "\t%9s: %s %s seq %u\n",
 478                            type,
 479                            fence->ops->get_driver_name(fence),
 480                            fence->ops->get_timeline_name(fence),
 481                            fence->seqno);
 482 }
 483
 484 static void etnaviv_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 485 {
 486         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 487         struct reservation_object *robj = etnaviv_obj->resv;
 488         struct reservation_object_list *fobj;
 489         struct fence *fence;
 490         unsigned long off = drm_vma_node_start(&obj->vma_node);
 491
 492         seq_printf(m, "%08x: %c %2d (%2d) %08lx %p %zd\n",
 493                         etnaviv_obj->flags, is_active(etnaviv_obj) ? 'A' : 'I',
 494                         obj->name, obj->refcount.refcount.counter,
 495                         off, etnaviv_obj->vaddr, obj->size);
 496
 497         rcu_read_lock();
 498         fobj = rcu_dereference(robj->fence);
 499         if (fobj) {
 500                 unsigned int i, shared_count = fobj->shared_count;
 501
 502                 for (i = 0; i < shared_count; i++) {
 503                         fence = rcu_dereference(fobj->shared[i]);
 504                         etnaviv_gem_describe_fence(fence, "Shared", m);
 505                 }
 506         }
 507
 508         fence = rcu_dereference(robj->fence_excl);
 509         if (fence)
 510                 etnaviv_gem_describe_fence(fence, "Exclusive", m);
 511         rcu_read_unlock();
 512 }
 513
 514 void etnaviv_gem_describe_objects(struct etnaviv_drm_private *priv,
 515         struct seq_file *m)
 516 {
 517         struct etnaviv_gem_object *etnaviv_obj;
 518         int count = 0;
 519         size_t size = 0;
 520
 521         mutex_lock(&priv->gem_lock);
 522         list_for_each_entry(etnaviv_obj, &priv->gem_list, gem_node) {
 523                 struct drm_gem_object *obj = &etnaviv_obj->base;
 524
 525                 seq_puts(m, "   ");
 526                 etnaviv_gem_describe(obj, m);
 527                 count++;
 528                 size += obj->size;
 529         }
 530         mutex_unlock(&priv->gem_lock);
 531
 532         seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
 533 }
 534 #endif
 535
 536 static void etnaviv_gem_shmem_release(struct etnaviv_gem_object *etnaviv_obj)
 537 {
 538         vunmap(etnaviv_obj->vaddr);
 539         put_pages(etnaviv_obj);
 540 }
 541
 542 static const struct etnaviv_gem_ops etnaviv_gem_shmem_ops = {
 543         .get_pages = etnaviv_gem_shmem_get_pages,
 544         .release = etnaviv_gem_shmem_release,
 545         .vmap = etnaviv_gem_vmap_impl,
 546         .mmap = etnaviv_gem_mmap_obj,
 547 };
 548
 549 void etnaviv_gem_free_object(struct drm_gem_object *obj)
 550 {
 551         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 552         struct etnaviv_vram_mapping *mapping, *tmp;
 553
 554         /* object should not be active */
 555         WARN_ON(is_active(etnaviv_obj));
 556
 557         list_del(&etnaviv_obj->gem_node);
 558
 559         list_for_each_entry_safe(mapping, tmp, &etnaviv_obj->vram_list,
 560                                  obj_node) {
 561                 struct etnaviv_iommu *mmu = mapping->mmu;
 562
 563                 WARN_ON(mapping->use);
 564
 565                 if (mmu)
 566                         etnaviv_iommu_unmap_gem(mmu, mapping);
 567
 568                 list_del(&mapping->obj_node);
 569                 kfree(mapping);
 570         }
 571
 572         drm_gem_free_mmap_offset(obj);
 573         etnaviv_obj->ops->release(etnaviv_obj);
 574         if (etnaviv_obj->resv == &etnaviv_obj->_resv)
 575                 reservation_object_fini(&etnaviv_obj->_resv);
 576         drm_gem_object_release(obj);
 577
 578         kfree(etnaviv_obj);
 579 }
 580
 581 int etnaviv_gem_obj_add(struct drm_device *dev, struct drm_gem_object *obj)
 582 {
 583         struct etnaviv_drm_private *priv = dev->dev_private;
 584         struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
 585
 586         mutex_lock(&priv->gem_lock);
 587         list_add_tail(&etnaviv_obj->gem_node, &priv->gem_list);
 588         mutex_unlock(&priv->gem_lock);
 589
 590         return 0;
 591 }
 592
 593 static int etnaviv_gem_new_impl(struct drm_device *dev, u32 size, u32 flags,
 594         struct reservation_object *robj, const struct etnaviv_gem_ops *ops,
 595         struct drm_gem_object **obj)
 596 {
 597         struct etnaviv_gem_object *etnaviv_obj;
 598         unsigned sz = sizeof(*etnaviv_obj);
 599         bool valid = true;
 600
 601         /* validate flags */
 602         switch (flags & ETNA_BO_CACHE_MASK) {
 603         case ETNA_BO_UNCACHED:
 604         case ETNA_BO_CACHED:
 605         case ETNA_BO_WC:
 606                 break;
 607         default:
 608                 valid = false;
 609         }
 610
 611         if (!valid) {
 612                 dev_err(dev->dev, "invalid cache flag: %x\n",
 613                         (flags & ETNA_BO_CACHE_MASK));
 614                 return -EINVAL;
 615         }
 616
 617         etnaviv_obj = kzalloc(sz, GFP_KERNEL);
 618         if (!etnaviv_obj)
 619                 return -ENOMEM;
 620
 621         etnaviv_obj->flags = flags;
 622         etnaviv_obj->ops = ops;
 623         if (robj) {
 624                 etnaviv_obj->resv = robj;
 625         } else {
 626                 etnaviv_obj->resv = &etnaviv_obj->_resv;
 627                 reservation_object_init(&etnaviv_obj->_resv);
 628         }
 629
 630         mutex_init(&etnaviv_obj->lock);
 631         INIT_LIST_HEAD(&etnaviv_obj->vram_list);
 632
 633         *obj = &etnaviv_obj->base;
 634
 635         return 0;
 636 }
 637
 638 static struct drm_gem_object *__etnaviv_gem_new(struct drm_device *dev,
 639                 u32 size, u32 flags)
 640 {
 641         struct drm_gem_object *obj = NULL;
 642         int ret;
 643
 644         size = PAGE_ALIGN(size);
 645
 646         ret = etnaviv_gem_new_impl(dev, size, flags, NULL,
 647                                    &etnaviv_gem_shmem_ops, &obj);
 648         if (ret)
 649                 goto fail;
 650
 651         ret = drm_gem_object_init(dev, obj, size);
 652         if (ret == 0) {
 653                 struct address_space *mapping;
 654
 655                 /*
 656                  * Our buffers are kept pinned, so allocating them
 657                  * from the MOVABLE zone is a really bad idea, and
 658                  * conflicts with CMA.  See coments above new_inode()
 659                  * why this is required _and_ expected if you're
 660                  * going to pin these pages.
 661                  */
 662                 mapping = obj->filp->f_mapping;
 663                 mapping_set_gfp_mask(mapping, GFP_HIGHUSER);
 664         }
 665
 666         if (ret)
 667                 goto fail;
 668
 669         return obj;
 670
 671 fail:
 672         drm_gem_object_unreference_unlocked(obj);
 673         return ERR_PTR(ret);
 674 }
 675
 676 /* convenience method to construct a GEM buffer object, and userspace handle */
 677 int etnaviv_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 678                 u32 size, u32 flags, u32 *handle)
 679 {
 680         struct drm_gem_object *obj;
 681         int ret;
 682
 683         obj = __etnaviv_gem_new(dev, size, flags);
 684         if (IS_ERR(obj))
 685                 return PTR_ERR(obj);
 686
 687         ret = etnaviv_gem_obj_add(dev, obj);
 688         if (ret < 0) {
 689                 drm_gem_object_unreference_unlocked(obj);
 690                 return ret;
 691         }
 692
 693         ret = drm_gem_handle_create(file, obj, handle);
 694
 695         /* drop reference from allocate - handle holds it now */
 696         drm_gem_object_unreference_unlocked(obj);
 697
 698         return ret;
 699 }
 700
 701 struct drm_gem_object *etnaviv_gem_new(struct drm_device *dev,
 702                 u32 size, u32 flags)
 703 {
 704         struct drm_gem_object *obj;
 705         int ret;
 706
 707         obj = __etnaviv_gem_new(dev, size, flags);
 708         if (IS_ERR(obj))
 709                 return obj;
 710
 711         ret = etnaviv_gem_obj_add(dev, obj);
 712         if (ret < 0) {
 713                 drm_gem_object_unreference_unlocked(obj);
 714                 return ERR_PTR(ret);
 715         }
 716
 717         return obj;
 718 }
 719
 720 int etnaviv_gem_new_private(struct drm_device *dev, size_t size, u32 flags,
 721         struct reservation_object *robj, const struct etnaviv_gem_ops *ops,
 722         struct etnaviv_gem_object **res)
 723 {
 724         struct drm_gem_object *obj;
 725         int ret;
 726
 727         ret = etnaviv_gem_new_impl(dev, size, flags, robj, ops, &obj);
 728         if (ret)
 729                 return ret;
 730
 731         drm_gem_private_object_init(dev, obj, size);
 732
 733         *res = to_etnaviv_bo(obj);
 734
 735         return 0;
 736 }
 737
 738 struct get_pages_work {
 739         struct work_struct work;
 740         struct mm_struct *mm;
 741         struct task_struct *task;
 742         struct etnaviv_gem_object *etnaviv_obj;
 743 };
 744
 745 static struct page **etnaviv_gem_userptr_do_get_pages(
 746         struct etnaviv_gem_object *etnaviv_obj, struct mm_struct *mm, struct task_struct *task)
 747 {
 748         int ret = 0, pinned, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 749         struct page **pvec;
 750         uintptr_t ptr;
 751         unsigned int flags = 0;
 752
 753         pvec = drm_malloc_ab(npages, sizeof(struct page *));
 754         if (!pvec)
 755                 return ERR_PTR(-ENOMEM);
 756
 757         if (!etnaviv_obj->userptr.ro)
 758                 flags |= FOLL_WRITE;
 759
 760         pinned = 0;
 761         ptr = etnaviv_obj->userptr.ptr;
 762
 763         down_read(&mm->mmap_sem);
 764         while (pinned < npages) {
 765                 ret = get_user_pages_remote(task, mm, ptr, npages - pinned,
 766                                             flags, pvec + pinned, NULL);
 767                 if (ret < 0)
 768                         break;
 769
 770                 ptr += ret * PAGE_SIZE;
 771                 pinned += ret;
 772         }
 773         up_read(&mm->mmap_sem);
 774
 775         if (ret < 0) {
 776                 release_pages(pvec, pinned, 0);
 777                 drm_free_large(pvec);
 778                 return ERR_PTR(ret);
 779         }
 780
 781         return pvec;
 782 }
 783
 784 static void __etnaviv_gem_userptr_get_pages(struct work_struct *_work)
 785 {
 786         struct get_pages_work *work = container_of(_work, typeof(*work), work);
 787         struct etnaviv_gem_object *etnaviv_obj = work->etnaviv_obj;
 788         struct page **pvec;
 789
 790         pvec = etnaviv_gem_userptr_do_get_pages(etnaviv_obj, work->mm, work->task);
 791
 792         mutex_lock(&etnaviv_obj->lock);
 793         if (IS_ERR(pvec)) {
 794                 etnaviv_obj->userptr.work = ERR_CAST(pvec);
 795         } else {
 796                 etnaviv_obj->userptr.work = NULL;
 797                 etnaviv_obj->pages = pvec;
 798         }
 799
 800         mutex_unlock(&etnaviv_obj->lock);
 801         drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
 802
 803         mmput(work->mm);
 804         put_task_struct(work->task);
 805         kfree(work);
 806 }
 807
 808 static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
 809 {
 810         struct page **pvec = NULL;
 811         struct get_pages_work *work;
 812         struct mm_struct *mm;
 813         int ret, pinned, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 814
 815         if (etnaviv_obj->userptr.work) {
 816                 if (IS_ERR(etnaviv_obj->userptr.work)) {
 817                         ret = PTR_ERR(etnaviv_obj->userptr.work);
 818                         etnaviv_obj->userptr.work = NULL;
 819                 } else {
 820                         ret = -EAGAIN;
 821                 }
 822                 return ret;
 823         }
 824
 825         mm = get_task_mm(etnaviv_obj->userptr.task);
 826         pinned = 0;
 827         if (mm == current->mm) {
 828                 pvec = drm_malloc_ab(npages, sizeof(struct page *));
 829                 if (!pvec) {
 830                         mmput(mm);
 831                         return -ENOMEM;
 832                 }
 833
 834                 pinned = __get_user_pages_fast(etnaviv_obj->userptr.ptr, npages,
 835                                                !etnaviv_obj->userptr.ro, pvec);
 836                 if (pinned < 0) {
 837                         drm_free_large(pvec);
 838                         mmput(mm);
 839                         return pinned;
 840                 }
 841
 842                 if (pinned == npages) {
 843                         etnaviv_obj->pages = pvec;
 844                         mmput(mm);
 845                         return 0;
 846                 }
 847         }
 848
 849         release_pages(pvec, pinned, 0);
 850         drm_free_large(pvec);
 851
 852         work = kmalloc(sizeof(*work), GFP_KERNEL);
 853         if (!work) {
 854                 mmput(mm);
 855                 return -ENOMEM;
 856         }
 857
 858         get_task_struct(current);
 859         drm_gem_object_reference(&etnaviv_obj->base);
 860
 861         work->mm = mm;
 862         work->task = current;
 863         work->etnaviv_obj = etnaviv_obj;
 864
 865         etnaviv_obj->userptr.work = &work->work;
 866         INIT_WORK(&work->work, __etnaviv_gem_userptr_get_pages);
 867
 868         etnaviv_queue_work(etnaviv_obj->base.dev, &work->work);
 869
 870         return -EAGAIN;
 871 }
 872
 873 static void etnaviv_gem_userptr_release(struct etnaviv_gem_object *etnaviv_obj)
 874 {
 875         if (etnaviv_obj->sgt) {
 876                 etnaviv_gem_scatterlist_unmap(etnaviv_obj);
 877                 sg_free_table(etnaviv_obj->sgt);
 878                 kfree(etnaviv_obj->sgt);
 879         }
 880         if (etnaviv_obj->pages) {
 881                 int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
 882
 883                 release_pages(etnaviv_obj->pages, npages, 0);
 884                 drm_free_large(etnaviv_obj->pages);
 885         }
 886         put_task_struct(etnaviv_obj->userptr.task);
 887 }
 888
 889 static int etnaviv_gem_userptr_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
 890                 struct vm_area_struct *vma)
 891 {
 892         return -EINVAL;
 893 }
 894
 895 static const struct etnaviv_gem_ops etnaviv_gem_userptr_ops = {
 896         .get_pages = etnaviv_gem_userptr_get_pages,
 897         .release = etnaviv_gem_userptr_release,
 898         .vmap = etnaviv_gem_vmap_impl,
 899         .mmap = etnaviv_gem_userptr_mmap_obj,
 900 };
 901
 902 int etnaviv_gem_new_userptr(struct drm_device *dev, struct drm_file *file,
 903         uintptr_t ptr, u32 size, u32 flags, u32 *handle)
 904 {
 905         struct etnaviv_gem_object *etnaviv_obj;
 906         int ret;
 907
 908         ret = etnaviv_gem_new_private(dev, size, ETNA_BO_CACHED, NULL,
 909                                       &etnaviv_gem_userptr_ops, &etnaviv_obj);
 910         if (ret)
 911                 return ret;
 912
 913         etnaviv_obj->userptr.ptr = ptr;
 914         etnaviv_obj->userptr.task = current;
 915         etnaviv_obj->userptr.ro = !(flags & ETNA_USERPTR_WRITE);
 916         get_task_struct(current);
 917
 918         ret = etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
 919         if (ret)
 920                 goto unreference;
 921
 922         ret = drm_gem_handle_create(file, &etnaviv_obj->base, handle);
 923 unreference:
 924         /* drop reference from allocate - handle holds it now */
 925         drm_gem_object_unreference_unlocked(&etnaviv_obj->base);
 926         return ret;
 927 }